Using api version and not project version to allow for upgrade

Change-Id: I8736baa434c162f1cc06f6cf4482c55dbd874b15
diff --git a/app/features.xml b/app/features.xml
index fffac01..7f3f988 100644
--- a/app/features.xml
+++ b/app/features.xml
@@ -20,7 +20,7 @@
         <feature>onos-api</feature>
         <bundle>mvn:${project.groupId}/olt-impl/${project.version}</bundle>
         <bundle>mvn:${project.groupId}/olt-web/${project.version}</bundle>
-        <bundle>mvn:${project.groupId}/olt-api/${project.version}</bundle>
+        <bundle>mvn:${project.groupId}/olt-api/${olt.api.version}</bundle>
         <bundle>mvn:${project.groupId}/sadis-api/${sadis.api.version}</bundle>
     </feature>
 </features>